* {
    padding: 0;
    margin: 0;
}

body {
    width: 100%;
    margin: auto;
    background-color: wheat;
}

#head {
    width: 100%;
    height: 88px;
    background-color: #39C5BB;
}

#daiban {
    width: 80%;
    height: 45px;
    margin-left: 120px;
    margin-top: 20px;
    background-color: #66CCFF;
    font-size: 30px;
}

input::-webkit-input-placeholder {
    color: white;
    font-size: 30px;
    position: fixed;
    top: 1px;
    left: 15px;
}

input::-moz-placeholder {
    color: white;
    font-size: 30px;
    position: fixed;
    top: 1px;
    left: 15px;
}

input:-ms-input-placeholder {
    color: white;
    font-size: 30px;
    position: fixed;
    top: 1px;
    left: 15px;
}

svg {
    height: 45px;
    width: 45px;
    margin: auto;

}

#add {
    position: absolute;
    height: 49px;
    width: 50px;
    top: 20px;
    background-color: white;

}
#add:hover{background-color: cadetblue;}

#container {
    width: 80%;
    margin: auto;
    display: flex;
    position: relative;
    top: 20px;
}

.column {
    flex: 1;
    padding: 10px;
    background-color: #66CCFF;
    font-size: 30px;
}

.left.column {
    margin-right: 10px;
}

ul#Notfinished:empty:after {
    content: '你没有其他的待办了!';
    margin: 10px 0 0 0;
    color: aliceblue;
}

ul#finished:empty:after {
    content: '你还没有完成的待办!';
    margin: 10px 0 0 0;
    color: aliceblue;
}

li {
    color: black;
    list-style-type: none;
    counter-increment: number;
}

li::before {
    content: counter(number)".";
    color: white;
    letter-spacing: 0.1em;
}

button {
    margin-right: 3px;
}

button:hover {
    background-color: tomato;

    transition: all 0.5s;
}